-41.45% is the change from 866 to 507
Calculation steps:
[( 507 - 866 ) ÷ 866] x 100 = -41.45%
Formula
Percentage change = [(507 - 866) / 866] x 100
Subtract the new number by the original number
507 - 866 = -359
-359 ÷ 866 = -0.41454965357967666
-0.41454965357967666 x 100 = -41.45%